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想做一个简单的 微电容位移传感器 采用AD7150 来获得电容值
AD7150 是I2C传送数据，因为想做的简单，就用MSP430G2553单片机做主控，模拟I2C通信方式，来获取输入 程式语言部分该如何编码? 底下是我参考open source msp430g2xx3_uscib0_i2c_12.c 进行修改 但不了解各个状态要如何设定 (寄存器位址等)? 请各位大大协助 #include #include "msp430g2553.h" #define NUM_BYTES_TX 1 // How many bytes? #define NUM_BYTES_RX 1 int RXByteCtr, RPT_Flag = 0; // enables repeated start when 1 volatile unsigned char RxBuffer[128]; // Allocate 128 byte of RAM unsigned char *PTxData; // Pointer to TX data unsigned char *PRxData; // Pointer to RX data unsigned char TXByteCtr, RX = 0; unsigned char MSData = 0x55; unsigned int RxWord; unsigned int RxByteCtr; unsigned char i; float pFdata; float chRange; void Setup_TX(void); void Setup_RX(void); void Transmit(void); void Receive(void); float AD7150_Cap(void); void main(void) { WDTCTL = WDTPW + WDTHOLD; // Stop WDT P1SEL |= BIT6 + BIT7; // Assign I2C pins to USCI_B0 P1SEL2|= BIT6 + BIT7; // Assign I2C pins to USCI_B0 while(1){ //Transmit process Setup_TX(); RPT_Flag = 1; Transmit(); while (UCB0CTL1 & UCTXSTP); // Ensure stop condition got sent //Receive process Setup_RX(); Receive(); while (UCB0CTL1 & UCTXSTP); // Ensure stop condition got sent } } //------------------------------------------------------------------------------- // The USCI_B0 data ISR is used to move received data from the I2C slave // to the MSP430 memory. It is structured such that it can be used to receive // any 2+ number of bytes by pre-loading RXByteCtr with the byte count. //------------------------------------------------------------------------------- #pragma vector = USCIAB0TX_VECTOR __interrupt void USCIAB0TX_ISR(void) { if(RX == 1){ // Master Recieve? RXByteCtr--; // Decrement RX byte counter if (RXByteCtr) { *PRxData++ = UCB0RXBUF; // Move RX data to address PRxData } else { if(RPT_Flag == 0) UCB0CTL1 |= UCTXSTP; // No Repeated Start: stop condition if(RPT_Flag == 1){ // if Repeated Start: do nothing RPT_Flag = 0; } *PRxData = UCB0RXBUF; // Move final RX data to PRxData __bic_SR_register_on_exit(CPUOFF); // Exit LPM0 }} else{ // Master Transmit if (TXByteCtr) // Check TX byte counter { UCB0TXBUF = MSData++; // Load TX buffer TXByteCtr--; // Decrement TX byte counter } else { if(RPT_Flag == 1){ RPT_Flag = 0; PTxData = &MSData; // TX array start address TXByteCtr = NUM_BYTES_TX; // Load TX byte counter __bic_SR_register_on_exit(CPUOFF); } else{ UCB0CTL1 |= UCTXSTP; // I2C stop condition IFG2 &= ~UCB0TXIFG; // Clear USCI_B0 TX int flag __bic_SR_register_on_exit(CPUOFF); // Exit LPM0 } } } } void Setup_TX(void){ _DINT(); RX = 0; IE2 &= ~UCB0RXIE; while (UCB0CTL1 & UCTXSTP); // Ensure stop condition got sent// Disable RX interrupt UCB0CTL1 |= UCSWRST; // Enable SW reset UCB0CTL0 = UCMST + UCMODE_3 + UCSYNC; // I2C Master, synchronous mode UCB0CTL1 = UCSSEL_2 + UCSWRST; // Use SMCLK, keep SW reset UCB0BR0 = 12; // fSCL = SMCLK/12 = ~100kHz UCB0BR1 = 0; UCB0I2CSA = 0x48; // Slave Address is 048h UCB0CTL1 &= ~UCSWRST; // Clear SW reset, resume operation IE2 |= UCB0TXIE; // Enable TX interrupt } void Setup_RX(void){ _DINT(); RX = 1; IE2 &= ~UCB0TXIE; UCB0CTL1 |= UCSWRST; // Enable SW reset UCB0CTL0 = UCMST + UCMODE_3 + UCSYNC; // I2C Master, synchronous mode UCB0CTL1 = UCSSEL_2 + UCSWRST; // Use SMCLK, keep SW reset UCB0BR0 = 12; // fSCL = SMCLK/12 = ~100kHz UCB0BR1 = 0; UCB0I2CSA = 0x48; // Slave Address is 048h UCB0CTL1 &= ~UCSWRST; // Clear SW reset, resume operation IE2 |= UCB0RXIE; // Enable RX interrupt } void Transmit(void){ PTxData = &MSData; // TX array start address TXByteCtr = NUM_BYTES_TX; // Load TX byte counter while (UCB0CTL1 & UCTXSTP); // Ensure stop condition got sent UCB0CTL1 |= UCTR + UCTXSTT; // I2C TX, start condition __bis_SR_register(CPUOFF + GIE); // Enter LPM0 w/ interrupts } void Receive(void){ PRxData = (unsigned char *)RxBuffer; // Start of RX buffer RXByteCtr = NUM_BYTES_RX-1; // Load RX byte counter while (UCB0CTL1 & UCTXSTP); // Ensure stop condition got sent UCB0CTL1 |= UCTXSTT; // I2C start condition __bis_SR_register(CPUOFF + GIE); // Enter LPM0 w/ interrupts } float AD7150_Cap(void) { if(RxByteCtr < 0x3000) { RxByteCtr = 0x3000; } else if ( RxByteCtr >0XD000) { RxByteCtr = 0XD000; } pFdata =(((RxByteCtr)-0x3000)*1)/0x9FF0; return pFdata; } 最後是根據data sheet 所提供公式進行修改 
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非常抱歉，我们很难帮您验证代码。您是否可以将SCL和SDA这两个管脚的波形用示波器采集下来，上传。可以直观的看到这两个管脚的时序是否是正确的。
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给ADUM4223 增加信号驱动15V电压就不正常， 波动很大会被烧是什么情况？
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